Synthesis process of Ba-ferrites from α-FeOOH and γ-FeOOH and investigation of magnetic properties  

作　　者：CAO XiaoHui TAN YuZhuo MENG JinHong SUN Jie 

机构地区：[1]School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110036, China

出　　处：《Chinese Science Bulletin》2010年第18期1952-1956,共5页

摘　　要：The claviform BaFe12O19 crystals were synthesized by the precipitation-toptactic reaction method using α-FeOOH and γ-FeOOH as raw materials respectively.The synthesis processes of BaFe12O19,studied by XRD,SEM,EDS,FT-IR,and TG-DTA techniques,included preparations of precursor γ and precursor α,formations of α-Fe2O3 and BaFe2O4,and production of rod-like BaFe12O19 through dehydroxylation of pod-like FeOOH,followed by reactions of α-Fe2O3 with BaCO3 and BaFe2O4.The crystallinity of α-Fe2O3 and BaCO3 from precursor α was better than from precursor γ due to the direct dehydroxylation of α-FeOOH,resulting in a lower nucleation rate and better crystallinity of BaFe2O4.BaFe12O19 prepared from precursor α showed lower crystallinity and purity with a higher length-diameter ratio than from precursor γ.The VSM results proved that the appearance of final products had an important influence on magnetic properties.The claviform BaFe12019 crystals were synthesized by the precipitation-toptactic reaction method using α-FeOOH and γ-FeOOH as raw materials respectively. The synthesis processes of BaFe12O19, studied by XRD, SEM, EDS, FT-IR, and TG-DTA tech- niques, included preparations of precursor γ and precursor α, formations of α-Fe2O3 and BaFe2O4, and production of rod-like BaFe12O19 through dehydroxylation of pod-like FeOOH, followed by reactions of α-Fe2O3 with BaCO3 and BaFe20＋ The crystal- linity of α-Fe2O3 and BaCO3 from precursor α was better than from precursor 7 due to the direct dehydroxylation of α-FeOOH, resulting in a lower nucleation rate and better crystallinity of BaFe204. BaFe12O19 prepared from precursor α showed lower crys- tallinity and purity with a higher length-diameter ratio than from precursor γ. The VSM results proved that the appearance of final products had an important influence on magnetic properties.

关 键 词：FEOOH 钡铁氧体 合成过程 磁特性 Fe2O3 X射线衍射 铁氧体生产 BACO3 

分 类 号：TM277[一般工业技术—材料科学与工程]